input: ft5x06_ts: Add driver for ft5x06 series

Ft5x06 controllers are single chip capacitive
touch panel controller ICs with a built-in 8 bit
Micro Controller Unit. It supports multi-touch
capability and can detect up to five touches.

Change-Id: I39eb1175d473d1f2c463e1c4a0a1606307da9dc0
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>